What process compresses metal and reforms it to a specified dimension?

The process that compresses metal and reforms it to a specified dimension is swaging. Swaging involves the plastic deformation of metal, typically by means of a die, which physically compresses and reshapes the material without removing any excess material. It can be used to reduce the cross-sectional area of a workpiece or to produce specific features in the metal.

Other processes mentioned, such as trimming, resizing, and annealing, serve different purposes. Trimming refers to cutting or shaping metal to remove excess material, while resizing generally indicates altering the overall dimensions of an object, often through processes like forging or machining, not specifically through compression. Annealing, on the other hand, is a heat treatment process that softens the metal to relieve stresses and improve workability but does not involve reshaping it to a precise dimension.